You are correct. To quote me,
"To consider the casualty estimates of the invasion, against the casualties from the bombs, gives only a partial and parochial picture. The casualties, outside the Home Islands, for the last year of the war, monthly, throughout the theater, were ranging from 125,000 to 300,000 before the bombs were dropped. Each month the war continued, that continued- Allied, Japanese, Asian native peoples, military, civilian, young, old, POWs, lots of Chinese. The Japanese military were speaking in terms of a sacrifice of as many as 20,000,000 Japanese, in the ketsugo defense of the Home Islands (which was likely a hyperbolic statement, to be sure; the gyokusai, the shattering of the jewels). I recommend Giangreco’s HELL TO PAY (again) and Gruhl’s IMPERIAL JAPAN’S WORLD WAR II:1931-1945, on the subject of the casualties avoided by ending the war as quickly as possible, and the deaths that would continue, as it continued. See also Maddox (ed.) HIROSHIMA IN HISTORY, in general, and chaps 2-5, esp. And Newman’s TRUMAN AND THE HIROSHIMA CULT, passim, chaps 6-8, in particular.
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Had the war continued, other deaths across the theater would have continued also. In China, in Burma, as the British opened Operation Zipper, early in September, as the Japanese eliminated the 130,000+ POWS, as they were directed to do, upon an invasion, under the “Kill All” directive, as the conventional bombing of the Home Islands continued, with a roughly 60% increase in the total of B-29s available, as the destruction of the transportation systems in the Islands increased the starvation (a death the old and the young fall to especially). And, in the ultimate bloodbath, the invasions of Kyushu and Honshu: Olympic and Coronet. The bombs saved lives throughout the theater. Including many Japanese lives. Good."
This is a consequentalist/proportionalist position. No RC need accept it, as far as it contradicts the RCC teachings.
Be parsimonious, not profligate, with death.